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Open Access Effect of Holding Time on Microstructure and Mechanical Properties of K452 Superalloy Brazed Joints

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  Vacuum brazing of K452 superalloy was performed with cobalt-base filler metal and nickel-base superalloy powder under brazing conditions of 1170/10min, 1170/60min and 1170/120min respectively. The microstructure of brazed joints was analyzed by using SEM and EDS, and the high-temperature mechanical properties were also studied. The results show that the sound joints with fine microstructure and rare pores are achieved under 1170/60min brazing procedure, due to the good quality of interface. The joints braze under 1170/120min show the highest mechanical properties because of better interface quality, the average 900 tensile strength of 400MPa and 900/100MPa stress-rupture life of 141h/55min. But there morepoles are presented, and many white particles of compound congregated and grow up between the nickel-base superalloy powder in the brazing seam.
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Keywords: K452 superalloy; cobalt-base filler metal; mechanical property; microstructure; nickel-base superalloy powder

Document Type: Research Article

Publication date: June 15, 2015

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  • Journal of Aeronautical Materials, founded in 1981, is sponsored by Chinese Society of Aeronautics and Astronautics, and edited and published by editiorial board of Journal of Aeronautical Materials,AVIC Beijing Institute of Aeronautical Material(BIAM).It has been indexed in Scopus (Holland), INSPEC (U.K.), AJ (Russia), CA (US) and UPD (US). Journal of Aeronutical Materials is devoted to reporting new and original experimental and theoretical basic research of aeronautical materials, such as composite design,technology,testing and charaacterizing, and so on.
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